利用DL-T5000型二氧化碳激光器在QT-500球墨铸铁表面熔覆铁基合金层，分析了激光熔覆层的显微组织，测试了其显微硬度及磨损性能。结果表明：制备的熔覆层组织致密、无裂纹，与基体形成了良好的冶金结合；从熔覆层表面到热影响区的组织依次为大量的树枝晶、等轴晶、树枝晶；熔覆层的硬度较基体的提高了2．5倍，其磨损量约为基体的1／3，熔覆层耐磨性能增强的主要原因是铁基合金与元素镍、铬等形成固溶体和碳化物等的强化作用所致。
Laser cladding of Fe-based alloy layer on QT-500 ductile cast iron surface was carried out by DL- TS000 CO2 laser. The microstructure, microhardness and wear resistance of the laser cladding layers were analyzed and tested. The results show that the cladding layers had compact and flawless microstructure that had been integrated metallurgical bonding with substrate. Microstructure of the cladding zone consisted of massive branch crystal, equiax crystal and branch crystal in turn from the surface of cladding layers to heat＋affected zone. The microhardness of the layers increased 2.5 times campared with that of the substrate and the abrasion weight was one third of that for the substrate. The reasons of the wear resistance improving were mainly strength due to solid solution formation of elements Ni and Cr to Fe-based alloy and carbides.
参考文献
| [1] | 杨胶溪,左铁钏,徐文清,高协清.球墨铸铁表面激光熔覆钴基合金涂层的研究[J].激光技术,2006(05):517-519. |
| [2] | 张云凤,闫玉涛,孙志礼.铸铁CrMo表面激光熔覆Ni基高温合金粉末的磨损特性[J].润滑与密封,2007(07):108-110,117. |
| [3] | 陈莉,赵宇,黄凤晓,刘喜明.铸铁表面激光熔覆铁基自熔合金的组织与性能[J].热加工工艺,2005(01):46-48. |
| [4] | 孙颖 .球墨铸铁的激光硬化层及其耐磨性的研究[D].鞍山科技大学,2006. |
| [5] | 李明喜,何宜柱,孙国雄.铸铁基体上激光熔覆H（o）ganas钴基合金凝固组织的研究[J].现代铸铁,2002(02):8-11. |
| [6] | 刘喜明,连建设,季长涛,王昊,高雅丽,王耀民.铁素体基球墨铸铁激光表面重熔后的组织与性能[J].材料热处理学报,2002(03):55-58. |
| [7] | 刘燕,任露泉,于思荣,韩志武.灰铸铁激光熔覆纳米Al2O3的性能研究[J].功能材料,2005(08):1265-1267. |
| [8] | 王义厢,李宝增,宫耀华,程占保.45钢表面激光熔覆铁基合金涂层显微组织与性能[J].热加工工艺,2008(21):131-133. |
| [9] | 于有生,倪火炬,温家伶.铁基合金激光熔覆的研究[J].中国表面工程,2004(04):24-27,31. |
| [10] | 尹紫光 .高硬度材料激光熔覆镍基合金技术研究[D].长春理工大学,2008. |
| [11] | 臧辰峰,赵鹏飞,张小彬,刘常升.碳钢表面激光熔覆镍基合金涂层及其高温磨损行为[J].东北大学学报（自然科学版）,2009(10):1437-1440. |
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